.eslintrc.js

'use strict'
module.exports = {
  root: true,
  env: {
    es6: true,
    node: true
  },
  globals: {
    console: true
  },
  parserOptions: {
    ecmaVersion: 2017,
    sourceType: 'module'
  },
  settings: {
    'import/ignore': ['node_modules'],
    'import/extensions': ['.js'],
    'import/resolver': {
      node: {
        extensions: ['.js', '.json'],
      }
    }
  },
  rules: {
    'array-callback-return': 'warn',
    'default-case': ['warn', {
      commentPattern: '^no default$'
    }],
    'dot-location': ['warn', 'property'],
    'eqeqeq': ['warn', 'allow-null'],
    'new-parens': 'warn',
    'no-array-constructor': 'warn',
    'no-caller': 'warn',
    'no-cond-assign': ['warn', 'always'],
    'no-const-assign': 'warn',
    'no-control-regex': 'warn',
    'no-delete-var': 'warn',
    'no-dupe-args': 'warn',
    'no-dupe-class-members': 'warn',
    'no-dupe-keys': 'warn',
    'no-duplicate-case': 'warn',
    'no-empty-character-class': 'warn',
    'no-empty-pattern': 'warn',
    'no-eval': 'warn',
    'no-ex-assign': 'warn',
    'no-extend-native': 'warn',
    'no-extra-bind': 'warn',
    'no-extra-label': 'warn',
    'no-fallthrough': 'warn',
    'no-func-assign': 'warn',
    'no-implied-eval': 'warn',
    'no-invalid-regexp': 'warn',
    'no-iterator': 'warn',
    'no-label-var': 'warn',
    'no-labels': ['warn', {
      allowLoop: true,
      allowSwitch: false
    }],
    'no-lone-blocks': 'warn',
    'no-loop-func': 'warn',
    'no-mixed-operators': [
      'warn',
      {
        groups: [
          ['==', '!=', '===', '!==', '>', '>=', '<', '<='],
          ['&&', '||'],
          ['in', 'instanceof'],
        ],
        allowSamePrecedence: false,
      },
    ],
    'no-return-await': 'warn',
    'require-await': 'error',
    'no-multi-str': 'warn',
    'no-native-reassign': 'warn',
    'no-negated-in-lhs': 'warn',
    'no-new-func': 'warn',
    'no-new-object': 'warn',
    'no-new-symbol': 'warn',
    'no-new-wrappers': 'warn',
    'no-obj-calls': 'warn',
    'no-octal': 'warn',
    'no-octal-escape': 'warn',
    'no-redeclare': 'warn',
    'no-regex-spaces': 'warn',
    'no-restricted-syntax': ['warn', 'WithStatement'],
    'no-script-url': 'warn',
    'no-self-assign': 'warn',
    'no-self-compare': 'warn',
    'no-sequences': 'warn',
    'no-shadow-restricted-names': 'warn',
    'no-sparse-arrays': 'warn',
    'no-template-curly-in-string': 'warn',
    'no-this-before-super': 'warn',
    'no-throw-literal': 'warn',
    'no-undef': 'error',
    'no-restricted-globals': ['error', 'event'],
    'no-unexpected-multiline': 'warn',
    'no-unreachable': 'warn',
    'no-unused-expressions': [
      'warn',
      {
        allowShortCircuit: true,
        allowTernary: true,
      },
    ],
    'no-unused-labels': 'warn',
    'no-unused-vars': [
      'warn',
      {
        vars: 'local',
        varsIgnorePattern: '^_',
        args: 'none',
        ignoreRestSiblings: true,
      },
    ],
    'no-use-before-define': ['warn', 'nofunc'],
    'no-useless-computed-key': 'warn',
    'no-useless-concat': 'warn',
    'no-useless-constructor': 'warn',
    'no-useless-escape': 'warn',
    'no-useless-rename': [
      'warn',
      {
        ignoreDestructuring: false,
        ignoreImport: false,
        ignoreExport: false,
      },
    ],
    'no-with': 'warn',
    'no-whitespace-before-property': 'warn',
    'operator-assignment': ['warn', 'always'],
    radix: 'warn',
    'require-yield': 'warn',
    'rest-spread-spacing': ['warn', 'never'],
    strict: ['warn', 'never'],
    'unicode-bom': ['warn', 'never'],
    'use-isnan': 'warn',
    'valid-typeof': 'warn'
  },
}